Basics
Table 4.3 Unbalanced Load Factor (Ku)
Lifting Strands
Factor
2 4
0.6
0.36
5. Unbalanced load coefficient; Ku When you use two or four chains in a hanging application or shuttle traction setup, the tension of each chain is not equal. This must be accounted for by using the coefficient found in Table 4.3. The example assumes an unbalanced load ratio between two chains of 60/40 (percent) [i.e., 60 + 40 = 100 percent].
4.1.3 Drive Chain Selection (General Selection) A suitable chain selection may be made according to the flow chart Figure 4.8. EXAMPLE: Select a transmission chain for the conditions shown in Figure 4.9.
1,500
(i=1/30)
Reducer
Drive Roller Chain
Type of Application: Drive of Belt Conveyor Source of Power: Electric Motor 7.5 kW Drive Shaft: Diameter 66 mm. 50 rpm Driven Shaft: Diameter 94 mm. 20 rpm Center Distance of Shafts: 1,500 mm
Starting Frequency: 4 times/day Type of Impact: Some Impact Reducer Ratio: 1/30
Figure 4.9 Operating Conditions for Example 4.1.3
Step 1. Confirm the operating conditions. Step 2. Determine the service factor K s as shown in Table 4.2. In this example, the service factor is K s = 1.3. Step 3. Calculate the corrected design power kW = 1.3 3 7.5 = 9.75 kW. Step 4. Consult the selection table (Figure 4.10). For n = 50 rpm and corrected power = 9.75 kW, you should initially select RS140 chain and a 15-tooth drive sprocket. These are not the final selections. See manufacturer’s catalog for additional information.
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